I received a call but there was complete silence. After roughly ten seconds, I heard a beep followed by a robotic voice uttering "goodbye".

I picked up the phone, only to be greeted by a recorded message stating, "In relation to your query, this is a return call, please ring us back." Then, before I could gather my thoughts, it just cut off without even clarifying their identity or where the call originated from. No chance I'm calling them back!